Which of the following are sources of Law in India

Which of the following is/are source/ sources of Law in India?

1. Constitution of India
2. Statutes
3. Customary Law 
4. Case Law

Select the correct answer using the code given below.

1. 1 only
2. 1, 2 and 4 only
3. 2 and 3 only
4. 1, 2, 3 and 4